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Count characters, words and lines as you type.
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Text Diff
Compare two texts and highlight exactly what changed.
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Processed locallyAbout Text Diff
Compares two texts line by line and marks additions, removals and edits, entirely in the browser.
- 1
Compares two versions **line by line**, labelling each as unchanged, added or removed, with counts for the added and removed lines.
- 2
Alignment resynchronises by looking **up to five lines ahead**, so the usual edits (changing a few lines, inserting a few) produce a readable diff.
- 3
Everything runs locally, which suits configs, logs and draft copy — nothing is uploaded anywhere.
- 1
Paste a version on each side
Old on the left, new on the right, then run the comparison.
- 2
Read the three markers
Green is added, red is removed, and unchanged lines stay visible for context.
- 3
Check the counts
The header counts added and removed lines, which is the quickest read on how big the change is.
Because the granularity is the **line**: any difference in a line makes it "remove the old one, add a new one". For character-level detail you need a tool that highlights inside the line (git `--word-diff`, for instance) — this site does not have a character-level diff yet.
Because resynchronisation only looks **five lines ahead**: once an inserted or deleted block is longer than that, the algorithm cannot find the matching point and treats the rest as removed plus added. It is a known limit of this implementation — the result is still correct (all the content is there), just less readable.
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